Adjusting device of warp tension in automatic looms



Y. NOGAMY Jan. 15, 1935.

ADJUSTING DEVICE OF WARP TENSION IN AUTOMATIC LOOMS Filed May 9, 1955 Z SheetS -Sheet 1 v Y j Nogorng INVENTOI? I 8; ATTKL Y. NOGAMY Jan. 15, 1935.

ADJUSTING DEVICE OF WARP TENSION IN AUTOMATIC LOOMS Filed May 9, 1953 2 Sheets-Sheet 2 suspended along its Patented Jan. 15, 1935 UNITED STATES ADJUSTING nnvrcn or wear TENSION aprons-r10 LOOMS Yaejy Nogamy, Nagoya, Japan Application In my a. 193:, Serial No. 010,129 Japan December 2, 1932 1 Claim. (01. 139-110) The present invention relates to the adiustinl device of warp tension to co-operate with the letoff motion in automatic looms.

This adjusting device consistsof 'a link lever vertical axis combined with a bell crank provided with a slot in each arm'so as to co -operate through a pin bracket having the pivots on each end.

' The object of this invention is to obtain a sensitive adjustment by a simple mechanism andto reduce the deposition of cotton dust by arranging the parts in an up-right form.

The device will be described more in detail with reference to the accompanying drawings in which;

Fig. 1 isa front elevation of the device embodying this invention.

Fig. 2 is a plan view thereof.

Fig. 3A is an enlarged front view of the compound inverted-lever and Fig. 3B is the side view thereof.

Figs. 4 and 5 show' a front and side elevation of.

the lever mechanisms.

In the-drawings, 1 designates a vertical linklever suspended by a rod 6 pivoted at its lower end and having a slot 2 along its longitudinal axis and a pin 3 at its upper end.

A pin 5 fixed on the lower end of the bracket .4 is inserted into the slot 2 of the 1111 1 and the bracket 4 has a pin 12 on the upper end.

A bell crank '7 pivoted on the pin 12 has two arms 8, 9, having slots 10, 11, respectively, and the pin 3 engages with the slot 10.

The bracket 4 having the pins 5, 12 is ilxed to the loom frame 24 by bolts, thus theupper pin 12 forms the pivot of the bell-crank '7 and the lower pin 5 a fulcrum for the lever motion of the link lever 1. I

The upper end of the rod 6 is connected to the tension arm 13 and the lower end of the lever 1 is connected to the lower part of the slay sword is by the connecting rod 14.

The device is operated by, the motion of the slay sword 15;'which swings at a constant speed.

When the sword 15 moves back and forth, the

lever 1 swings about the pin 5 and the bell crank 7 swings on the pin 12, v

A pawl engagingwith' the ratchet wheel 1'! has an arm 16 engaging the slot 11 of the arm 9, hence the ratchet wheel 17 is operated by the swinging motion of the bell crank '1. 4

.The rotation of the ratchet wheel 1'! is transmitted to the warp beam 23 through the shaft lathe worm 19, the worm wheel 20, the spur wheel 21 and the flange wheel 22, and the warp beam 23 is rotated in accordance with the motion of the slay sword 15.

When the warp on the warp beam 23 decreases, the tension of the warp increases and depresses the outer end of the tension arm and the rod 6 is shifted together with the link lever 1. The fulcrum pin 5 changes its position in the slot 2. when the under leverage of the link lever 1 is shortened, the amplitude of the pin 3 is increased, and the swinging motion of the bell crank 7 is increased; consequently the angular velocities of the ratchet-wheel l7 and of the warp beam are increased. The amount of the warp being let off is increased to such a degree as to adjust the warp tension. 7

Fig. 4 explains the advantages of my device.

In prior compound levers the variation of the leverage due to the transposition of the fulcrum can be designated by the function in which L is the distance between the fulcrum and pivot of one of the componentrnembers and in which (1) is the sum of L2and 1'3, 1. e.,- the distance between the upper pin and the lower pin on the link lever.

' Thus, the variation of leverage of this compound inverted lever is greater than that of the compound lever hitherto used. The-greater variation of leverage gives more sensitive and effective adjustment for the .warp tension letting 06 from the beam.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim isz- In a device for adjusting warp tension in automatic looms, a slotted peer and a lower pin, a pivoted bell crank having a slot in which said lever is fulcrumed' by means of said upper pin, a slay sword pivotedly connected with the lower pin of said lever, a bracket pivoted at one end on the pivot point of said bell crank and having a pin near its other end cages-- in: the notch in said lever, the variation of leverage due to the vertical transposition of the, lever being the function L2 1 r ra where L is the distance between the upper pin in pins of said lever.

YAEJY NOGAMY. 

